Ortega RRG30E-DD Resonator Guitar. The Americana Series blends the traditional look and feel with contemporary appointments, just like its musical roots. Finishes like distressed satin distressed satin denim finish emphasize the origin. In the Americana Series, you can find the typical instruments for blues, bluegrass, and folk. A distinctive cone resonator that is integrated into the resonator guitars gives the characteristic overtone-rich twang.